#include <iostream>

using namespace std;

int main(int argc, char const *argv[])
{
    int num = 256;
    cout <<"十进制输出num："<< dec << num << endl;
    cout <<"八进制输出num："<< oct << num << endl;
    cout <<"十六进制输出num："<< hex << num << endl;
    return 0;
}
